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BUG: KCSAN: data-race in tcp_check_req / tcp_check_req

read to 0xffff888153c14f14 of 4 bytes by interrupt on cpu 0:
 tcp_check_req+0x32a/0xc70 net/ipv4/tcp_minisocks.c:622
 tcp_v4_rcv+0x12db/0x1b70 net/ipv4/tcp_ipv4.c:2071
 ip_protocol_deliver_rcu+0x356/0x6d0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x13c/0x1a0 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:303 [inline]
 ip_local_deliver+0xec/0x1c0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:468 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
 NF_HOOK include/linux/netfilter.h:303 [inline]
 ip_rcv+0x197/0x270 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5493 [inline]
 __netif_receive_skb+0x90/0x1b0 net/core/dev.c:5607
 process_backlog+0x21f/0x380 net/core/dev.c:5935
 __napi_poll+0x60/0x3b0 net/core/dev.c:6498
 napi_poll net/core/dev.c:6565 [inline]
 net_rx_action+0x32b/0x750 net/core/dev.c:6698
 __do_softirq+0xc1/0x265 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x57/0xa0 kernel/softirq.c:650
 sysvec_apic_timer_interrupt+0x36/0x80 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645

write to 0xffff888153c14f14 of 4 bytes by interrupt on cpu 1:
 tcp_check_req+0x694/0xc70 net/ipv4/tcp_minisocks.c:762
 tcp_v4_rcv+0x12db/0x1b70 net/ipv4/tcp_ipv4.c:2071
 ip_protocol_deliver_rcu+0x356/0x6d0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x13c/0x1a0 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:303 [inline]
 ip_local_deliver+0xec/0x1c0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:468 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
 NF_HOOK include/linux/netfilter.h:303 [inline]
 ip_rcv+0x197/0x270 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5493 [inline]
 __netif_receive_skb+0x90/0x1b0 net/core/dev.c:5607
 process_backlog+0x21f/0x380 net/core/dev.c:5935
 __napi_poll+0x60/0x3b0 net/core/dev.c:6498
 napi_poll net/core/dev.c:6565 [inline]
 net_rx_action+0x32b/0x750 net/core/dev.c:6698
 __do_softirq+0xc1/0x265 kernel/softirq.c:571
 do_softirq+0x7e/0xb0 kernel/softirq.c:472
 __local_bh_enable_ip+0x64/0x70 kernel/softirq.c:396
 local_bh_enable+0x1f/0x20 include/linux/bottom_half.h:33
 rcu_read_unlock_bh include/linux/rcupdate.h:843 [inline]
 __dev_queue_xmit+0xabb/0x1d10 net/core/dev.c:4271
 dev_queue_xmit include/linux/netdevice.h:3088 [inline]
 neigh_hh_output include/net/neighbour.h:528 [inline]
 neigh_output include/net/neighbour.h:542 [inline]
 ip_finish_output2+0x700/0x840 net/ipv4/ip_output.c:229
 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip_output+0xe5/0x1b0 net/ipv4/ip_output.c:431
 dst_output include/net/dst.h:458 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xa4d/0xa70 net/ipv4/ip_output.c:533
 ip_queue_xmit+0x38/0x40 net/ipv4/ip_output.c:547
 __tcp_transmit_skb+0x1194/0x16e0 net/ipv4/tcp_output.c:1399
 __tcp_send_ack+0x1de/0x2d0 net/ipv4/tcp_output.c:3983
 tcp_send_ack+0x27/0x30 net/ipv4/tcp_output.c:3989
 tcp_send_challenge_ack+0x1f5/0x210 net/ipv4/tcp_input.c:3657
 tcp_validate_incoming+0x865/0xe90 net/ipv4/tcp_input.c:5805
 tcp_rcv_established+0x452/0xea0 net/ipv4/tcp_input.c:6004
 tcp_v4_do_rcv+0x2d4/0x630 net/ipv4/tcp_ipv4.c:1722
 sk_backlog_rcv include/net/sock.h:1115 [inline]
 __release_sock+0xe5/0x240 net/core/sock.c:2917
 release_sock+0x44/0x110 net/core/sock.c:3484
 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1488
 inet_sendmsg+0x63/0x80 net/ipv4/af_inet.c:827
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 kernel_sendmsg+0x9b/0xf0 net/socket.c:767
 rds_tcp_sendmsg net/rds/tcp_send.c:66 [inline]
 rds_tcp_xmit+0x23f/0x5e0 net/rds/tcp_send.c:104
 rds_send_xmit+0xb87/0x1420 net/rds/send.c:367
 rds_send_worker+0x42/0x1d0 net/rds/threads.c:200
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0xabfc044c -> 0xabfc044d

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8004 Comm: kworker/u4:25 Not tainted 6.4.0-rc7-syzkaller-00041-ge660abd551f1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: krdsd rds_send_worker
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